Imaging lens system, image capturing device and electronic device

ABSTRACT

This disclosure provides an imaging lens system including, in order from an object side to an image side: a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; a second lens element with negative refractive power; a third lens element with refractive power, wherein an object-side surface and an image-side surface thereof are aspheric; a fourth lens element with refractive power, wherein an object-side surface and an image-side surface thereof are aspheric; and a fifth lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, which are both aspheric. The imaging lens system is further provided with an aperture stop, and there is no lens element with refractive power disposed between the aperture stop and the first lens element.

RELATED APPLICATIONS

This application is a continuation application of U.S. application Ser.No. 15/830,333 filed on Dec. 4, 2017, now approved, which is acontinuation application of U.S. application Ser. No. 14/828,141 filedon Aug. 17, 2015, now approved, which claims priority to TaiwanApplication Serial Number 104113652, filed Apr. 29, 2015, which isincorporated by reference herein in its entirety.

BACKGROUND Technical Field

The present disclosure relates to an imaging lens system and an imagecapturing device, and more particularly, to an imaging lens system andan image capturing device applicable to electronic devices.

Description of Related Art

As personal electronic products have been becoming more and morecompact, the internal components of the electronic products are alsorequired to be smaller in size than before, resulting in an increasingdemand for miniaturized optical systems. In addition to the demand ofminiaturization, the reduction of the pixel size of sensors in theadvanced semiconductor manufacturing technologies has enabled opticalsystems to evolve toward the field of higher megapixels. Meanwhile, thepopularity of smart phones and tablet computers greatly boosts the needfor miniaturized optical systems featuring high image quality.

A conventional telephoto optical system generally adopts a multi-elementstructure and comprises glass lens elements with spherical surfaces.Such a configuration not only results in a bulky lens assembly with lowportability, but the high price of the product has deterred largenumbers of consumers. Therefore, conventional optical systems can nolonger meet consumers' needs for convenience and multiple photographingfunctions.

Therefore, a need exists in the art for an optical system that featuresa miniaturized design and high image quality.

SUMMARY

According to one aspect of the present disclosure, an imaging lenssystem includes, in order from an object side to an image side: a firstlens element with positive refractive power having a convex object-sidesurface; a second lens element with negative refractive power; a thirdlens element with refractive power, wherein an object-side surface andan image-side surface thereof are aspheric; a fourth lens element withrefractive power, wherein an object-side surface and an image-sidesurface thereof are aspheric; and a fifth lens element with negativerefractive power having a concave object-side surface and a conveximage-side surface, which are both aspheric; wherein the imaging lenssystem is further provided with an aperture stop, and there is no lenselement with refractive power disposed between the aperture stop and thefirst lens element; wherein the imaging lens system has a total of fivelens elements with refractive power and an air gap is arranged on anoptical axis between every two adjacent lens elements with refractivepower; wherein a focal length of the imaging lens system is f, acurvature radius of the object-side surface of the first lens element isR1, a curvature radius of the image-side surface of the fourth lenselement is R8, an axial distance between the aperture stop and theimage-side surface of the fifth lens element is SD, an axial distancebetween the object-side surface of the first lens element and theimage-side surface of the fifth lens element is TD, an axial distancebetween the second lens element and the third lens element is T23, anaxial distance between the fourth lens element and the fifth lenselement is T45, an axial distance between the third lens element and thefourth lens element is T34, and the following conditions are satisfied:

3.3<f/R1;

−1.8<f/R8<1.8;

0.7<SD/TD<1.0; and

0.5<(T23+T45)/T34<6.0.

According to another aspect of the present disclosure, an imagecapturing device includes the aforementioned imaging lens system and animage sensor disposed on an image surface of the imaging lens system.

According to another aspect of the present disclosure, an electronicdevice includes the aforementioned image capturing device.

According to another aspect of the present disclosure, an imaging lenssystem includes, in order from an object side to an image side: a firstlens element with positive refractive power having a convex object-sidesurface; a second lens element with negative refractive power; a thirdlens element with refractive power, wherein an object-side surface andan image-side surface thereof are aspheric; a fourth lens element withrefractive power, wherein an object-side surface and an image-sidesurface thereof are aspheric; and a fifth lens element with negativerefractive power having a concave object-side surface and a conveximage-side surface, which are both aspheric; wherein the imaging lenssystem is further provided with an aperture stop, and there is no lenselement with refractive power disposed between the aperture stop and thefirst lens element; wherein the imaging lens system has a total of fivelens elements with refractive power and an air gap is arranged on anoptical axis between every two adjacent lens elements with refractivepower; wherein a focal length of the imaging lens system is f, acurvature radius of the object-side surface of the first lens element isR1, a curvature radius of the image-side surface of the fourth lenselement is R8, an axial distance between the aperture stop and theimage-side surface of the fifth lens element is SD, an axial distancebetween the object-side surface of the first lens element and image-sidesurface of the fifth lens element is TD, a central thickness of thethird lens element is CT3, an axial distance between the third lenselement and the fourth lens element is T34, and the following conditionsare satisfied:

3.3<f/R1;

−1.0<f/R8<1.0;

0.7<SD/TD<1.0; and

0.2<CT3/T34<2.2.

The present disclosure provides a telephoto imaging lens system forminiaturized devices. In addition to a telephoto function, the imaginglens system has a compact optical design that not only increases theportability but also significantly reduces the manufacturing cost sothat it has the potential to gain popularity and is applicable to a widerange of applications

The first lens element has positive refractive power so that theconvergent capability of the system is mainly contributed from theobject side of the lens assembly, thereby the system's size can beeffectively controlled to increase the portability. The second lenselement has negative refractive power so as to correct the chromaticaberration of the system. When the fifth lens element is a negative lenselement, the back focal length of the imaging lens system can beprevented from becoming too long so as to meet the requirement forminiaturization. Moreover, the fifth lens element has a concaveobject-side surface and a convex image-side surface so that it isfavorable for moving the principal point toward the object side and forcontrolling the field of view to facilitate the telephoto function.

When f/R1 satisfies the above condition, the photographing range can beeffectively restricted to enable certain local image patches to have ahigher resolution.

When f/R8 satisfies the above condition, the curvature of the image-sidesurface of the fourth lens element can be effectively controlled, andthe amount of stray light incident on the image surface can be reducedto improve the image quality of the optical system.

When (T23+T45)/T34 satisfies the above condition, the spatialarrangement of the system can be effectively controlled to attain abalance between easy assembly of the lens assembly and the configurationof shapes of lens surfaces.

When CT3/T34 satisfies the above condition, the thickness of the thirdlens element can be controlled to be within a reasonable range, and thedistance between the third lens element and the fourth lens element canbe adjusted to balance the configuration of the system.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic view of an image capturing device according tothe 1st embodiment of the present disclosure;

FIG. 1B shows longitudinal spherical aberration curves, astigmatic fieldcurves and a distortion curve of the image capturing device according tothe 1st embodiment;

FIG. 2A is a schematic view of an image capturing device according tothe 2nd embodiment of the present disclosure;

FIG. 2B shows longitudinal spherical aberration curves, astigmatic fieldcurves and a distortion curve of the image capturing device according tothe 2nd embodiment;

FIG. 3A is a schematic view of an image capturing device according tothe 3rd embodiment of the present disclosure;

FIG. 3B shows longitudinal spherical aberration curves, astigmatic fieldcurves and a distortion curve of the image capturing device according tothe 3rd embodiment;

FIG. 4A is a schematic view of an image capturing device according tothe 4th embodiment of the present disclosure;

FIG. 4B shows longitudinal spherical aberration curves, astigmatic fieldcurves and a distortion curve of the image capturing device according tothe 4th embodiment;

FIG. 5A is a schematic view of an image capturing device according tothe 5th embodiment of the present disclosure;

FIG. 5B shows longitudinal spherical aberration curves, astigmatic fieldcurves and a distortion curve of the image capturing device according tothe 5th embodiment;

FIG. 6A is a schematic view of an image capturing device according tothe 6th embodiment of the present disclosure;

FIG. 6B shows longitudinal spherical aberration curves, astigmatic fieldcurves and a distortion curve of the image capturing device according tothe 6th embodiment;

FIG. 7A is a schematic view of an image capturing device according tothe 7th embodiment of the present disclosure;

FIG. 7B shows longitudinal spherical aberration curves, astigmatic fieldcurves and a distortion curve of the image capturing device according tothe 7th embodiment;

FIG. 8A is a schematic view of an image capturing device according tothe 8th embodiment of the present disclosure;

FIG. 8B shows longitudinal spherical aberration curves, astigmatic fieldcurves and a distortion curve of the image capturing device according tothe 8th embodiment;

FIG. 9A is a schematic view of an image capturing device according tothe 9th embodiment of the present disclosure;

FIG. 9B shows longitudinal spherical aberration curves, astigmatic fieldcurves and a distortion curve of the image capturing device according tothe 9th embodiment;

FIG. 10A is a schematic view of an image capturing device according tothe 10th embodiment of the present disclosure;

FIG. 10B shows longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 10th embodiment;

FIG. 11 shows a distance in parallel with the optical axis between amaximum effective radius position on the image-side surface of the thirdlens element and a maximum effective radius position on the object-sidesurface of the fourth lens element.

FIG. 12A shows a smart phone with an image capturing device of thepresent disclosure installed therein;

FIG. 12B shows a tablet personal computer with an image capturing deviceof the present disclosure installed therein; and

FIG. 12C shows a wearable device with an image capturing device of thepresent disclosure installed therein.

DETAILED DESCRIPTION

The present disclosure provides an imaging lens system including, inorder from an object side to an image side, a first lens element, asecond lens element, a third lens element, a fourth lens element, and afifth lens element, wherein the imaging lens system has a total of fivelens elements with refractive power. The imaging lens system is furtherprovided with an aperture stop, and no lens element with refractivepower is disposed between the aperture stop and the first lens element.

The first lens element has positive refractive power so that theconvergent capability of the system is mainly contributed from theobject side of the lens assembly, thereby the system's size can beeffectively controlled to increase the portability. The object-sidesurface of the first lens element is convex in a paraxial region thereofso that the distribution of the positive refractive power can beadjusted to enhance the miniaturization of the system.

The second lens element has negative refractive power so as to correctthe chromatic aberration of the system. The image-side surface of thesecond lens element may be concave in a paraxial region thereof so as tofavorably correct the aberration.

The third lens element may have positive refractive power, so that it isfavorable for balancing the distribution of the refractive power of thesystem and thereby to reduce the sensitivity of the system. At least oneof the object-side surface and the image-side surface of the third lenselement may be provided with at least one inflection point so as tofavorably correct the aberration of the off-axis field and to suppressthe incident angle of the light projecting onto an image sensor from theoff-axis field to increase the receiving efficiency of the image sensor.

The fourth lens element may have negative refractive power. Theobject-side surface of the fourth lens element may be concave in aparaxial region thereof and the image-side surface of the fourth lenselement may be convex in a paraxial region thereof so as to favorablycorrect the astigmatism and thereby to improve the image quality.

The fifth lens element has negative refractive power so that the backfocal length of the imaging lens system can be favorably reduced to keepthe imaging lens system compact. The object-side surface of the fifthlens element may be concave in a paraxial region thereof and theimage-side surface of the fifth lens element may be convex in a paraxialregion thereof, so that it is favorable for moving the principal pointtoward the object side and for controlling the field of view tofacilitate the telephoto function.

When a focal length of the imaging lens system is f, a curvature radiusof the object-side surface of the first lens element is R1, and thefollowing condition is satisfied: 3.3<f/R1, the photographing range canbe effectively restricted to enable certain local image patches to havea higher resolution.

When the focal length of the imaging lens system is f, a curvatureradius of the image-side surface of the fourth lens element is R8, andthe following condition is satisfied: −1.8<f/R8<1.8, the curvature ofthe image-side surface of the fourth lens element can be effectivelycontrolled and the amount of stray light incident on the image surfacecan be reduced to improve the image quality of the imaging lens system.Preferably, the following condition is satisfied: −1.4<f/R8<1.4. Morepreferably, the following condition is satisfied: −1.0<f/R8<1.0.

When an axial distance between the aperture stop and the image-sidesurface of the fifth lens element is SD, an axial distance between theobject-side surface of the first lens element and the image-side surfaceof the fifth lens element is TD, and the following condition issatisfied: 0.7<SD/TD<1.0, the total track length of the system can bebalanced while the light entry angle is controlled so as to prevent thesystem from being too bulky.

When an axial distance between the second lens element and the thirdlens element is T23, an axial distance between the fourth lens elementand the fifth lens element is T45, an axial distance between the thirdlens element and the fourth lens element is T34, and the followingcondition is satisfied: 0.5<(T23+T45)/T34<6.0, the spatial arrangementof the system can be effectively controlled to attain a balance betweeneasy assembly of the lens assembly and the configuration of shapes oflens surfaces. Preferably, the following condition is satisfied:2.3<(T23+T45)/T34<5.5.

When a central thickness of the third lens element is CT3, the axialdistance between the third lens element and the fourth lens element isT34, and the following condition is satisfied: 0.2<CT3/T34<2.2, thethickness of the third lens element can be controlled to be within areasonable range, and the distance between the third lens element andthe fourth lens element can be adjusted to balance the configuration ofthe system. Preferably, the following condition is satisfied:0.5<CT3/T34<1.9.

When a focal length of the fourth lens element is f4, a focal length ofthe fifth lens element is f5, and the following condition is satisfied:0<f4/f5, it is favorable for reducing the sensitivity and sphericalaberration of the system.

When a curvature radius of the object-side surface of the fifth lenselement is R9, a curvature radius of the image-side surface of the fifthlens element is R10, and the following condition is satisfied:−1.0<(R9−R10)/(R9+R10)<0, it is favorable for correcting the astigmatismso as to maintain good image quality.

When the focal length of the imaging lens system is f, a maximum imageheight of the imaging lens system is ImgH (i.e. half of a diagonallength of an effective photosensitive area of the image sensor), and thefollowing condition is satisfied: 2.1<f/ImgH<6.0, it is favorable forkeeping the system compact and obtaining good image quality.

When the axial distance between the third lens element and the fourthlens element is T34, a distance in parallel with the optical axisbetween a maximum effective radius position on the image-side surface ofthe third lens element and a maximum effective radius position on theobject-side surface of the fourth lens element is ET34, and thefollowing condition is satisfied: 2.0<T34/ET34, the arrangement ofoptical path lengths of different lights from the off-axis field andangles of such lights can be adjusted to correct the aberration of theoff-axis field. Referring to FIG. 11, in the imaging lens system of thepresent disclosure, ET34 denotes the distance in parallel with theoptical axis between the maximum effective radius position on theimage-side surface of the third lens element (L3) and the maximumeffective radius position on the object-side surface of the fourth lenselement (L4), and the axial distance between the third lens element (L3)and the fourth lens element (L4) is T34.

When a maximum refractive index among the refractive indices of thefirst lens element, the second lens element, the third lens element, thefourth lens element, and the fifth lens elements is Nmax, and thefollowing condition is satisfied: 1.50<Nmax<1.70, it is favorable forarranging suitable materials for lens elements and for increasing theflexibility in design.

When an axial distance between the object-side surface of the first lenselement and an image surface is TL, the focal length of the imaging lenssystem is f, and the following condition is satisfied: 0.75<TL/f<1.0,the range of field of view can be effectively controlled whileminiaturization is achieved, thereby meeting the requirement formultiple photographing functions.

When half of maximal field of view of the imaging lens system is HFOV,and the following condition is satisfied: 0.3<tan(2*HFOV)<1.0, it isfavorable for capturing distant details and forming images thereof onthe image surface, thereby achieving telephoto effects.

When the axial distance between the object-side surface of the firstlens element and the image surface is TL, and the following condition issatisfied: TL<7.5 mm, the requirement for miniaturization can be met.

When an Abbe number of the second lens element is V2, an Abbe number ofthe third lens element is V3, an Abbe number of the first lens elementis V1, and the following condition is satisfied: 0.5<(V2+V3)N1<1.0, thechromatic aberration in the system can be effectively corrected toimprove the image quality.

When the curvature radius of the image-side surface of the fifth lenselement is R10, the curvature radius of the image-side surface of thefourth lens element is R8, and the following condition is satisfied:−0.2<R10/R8<0.9, the amount of stray light in the system can be reduced,and the back focal length of the system can also be effectivelycontrolled to meet the requirement for miniaturization.

When the maximum image height of the imaging lens system is ImgH, anentrance pupil diameter of the imaging lens system is EPD, and thefollowing condition is satisfied: 0.7<EPD/ImgH<1.6, a sufficient amountof incident light can be provided, and it is favorable for keeping theimaging lens system compact so that it can be equipped in a compactportable electronic product.

According to the imaging lens system of the present disclosure, the lenselements thereof can be made of glass or plastic material. When the lenselements are made of glass material, the distribution of the refractivepower of the imaging lens system may be more flexible to design. Whenthe lens elements are made of plastic material, the manufacturing costcan be effectively reduced. Furthermore, surfaces of each lens elementcan be arranged to be aspheric (ASP), since the aspheric surface of thelens element is easy to form a shape other than spherical surfaces so asto have more controllable variables for eliminating the aberrationthereof and to further decrease the required number of the lenselements, the total track length of the imaging lens system can beeffectively reduced.

According to the imaging lens system of the present disclosure, theimaging lens system can include at least one stop, such as an aperturestop, a glare stop or a field stop, so as to favorably reduce the amountof stray light and thereby to improve the image quality.

According to the imaging lens system of the present disclosure, a stopcan be configured as a front stop or a middle stop. A front stopdisposed between an imaged object and the first lens element can providea longer distance between an exit pupil of the imaging lens system andthe image surface, thereby the generated telecentric effect improves theimage-sensing efficiency of an image sensor, such as a CCD or CMOSsensor. A middle stop disposed between the first lens element and theimage surface is favorable for enlarging the field of view of theimaging lens system and thereby to provide a wider field of view for thesame.

According to the imaging lens system of the present disclosure, when thelens element has a convex surface and the region of convex shape is notdefined, it indicates that the surface is convex in the paraxial regionthereof; when the lens element has a concave surface and the region ofconcave shape is not defined, it indicates that the surface is concavein the paraxial region thereof. Likewise, when the region of refractivepower or focal length of a lens element is not defined, it indicatesthat the region of refractive power or focal length of the lens elementis in the paraxial region thereof.

According to the imaging lens system of the present disclosure, an imagesurface of the imaging lens system, based on the corresponding imagesensor, can be a plane or a curved surface with any curvature,especially a curved surface being concave facing towards the objectside.

The imaging lens system of the present disclosure can be optionallyapplied to moving focus optical systems. According to the imaging lenssystem of the present disclosure, the imaging lens system features goodcorrection capability and high image quality, and can be applied to 3D(three-dimensional) image capturing applications and electronic devices,such as digital cameras, mobile devices, digital tablets, smart TV,wireless monitoring device, motion sensing input device, drivingrecording system, rear view camera system, and wearable devices.

According to the present disclosure, an image capturing device includesthe aforementioned imaging lens system and an image sensor, wherein theimage sensor is disposed on or near an image surface of the imaging lenssystem. Therefore, the design of the imaging lens system enables theimage capturing device to achieve the best image quality. Preferably,the imaging lens system can further include a barrel member, a holdingmember or a combination thereof.

Referring to FIG. 12A, FIG. 12B and FIG. 12C, an image capturing device1201 may be installed in an electronic device, including, but notlimited to, a smart phone 1210, a tablet personal computer 1220 or awearable device 1230. The three exemplary figures of different kinds ofelectronic devices are only exemplary for showing the image capturingdevice of the present disclosure installed in an electronic device andare not limited thereto. Preferably, the electronic device can furtherinclude a control unit, a display unit, a storage unit, a random accessmemory unit (RAM) or a combination thereof.

According to the above description of the present disclosure, thefollowing 1st-10th specific embodiments are provided for furtherexplanation.

1st Embodiment

FIG. 1A is a schematic view of an image capturing device according tothe 1st embodiment of the present disclosure. FIG. 1B shows, in orderfrom left to right, longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 1st embodiment.

In FIG. 1A, the image capturing device includes an imaging lens system(not otherwise herein labeled) of the present disclosure and an imagesensor 180. The imaging lens system includes, in order from an objectside to an image side, a first lens element 110, a second lens element120, a third lens element 130, a fourth lens element 140, and a fifthlens element 150, wherein the imaging lens system has a total of fivelens elements (110-150) with refractive power.

The first lens element 110 with positive refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof, whichare both aspheric, and the first lens element 110 is made of plasticmaterial.

The second lens element 120 with negative refractive power has anobject-side surface 121 being concave in a paraxial region thereof andan image-side surface 122 being concave in a paraxial region thereof,which are both aspheric, and the second lens element 120 is made ofplastic material.

The third lens element 130 with positive refractive power has anobject-side surface 131 being convex in a paraxial region thereof and animage-side surface 132 being concave in a paraxial region thereof, whichare both aspheric, and the third lens element 130 is made of plasticmaterial. Furthermore, the image-side surface 132 of the third lenselement 130 has at least one inflection point.

The fourth lens element 140 with negative refractive power has anobject-side surface 141 being concave in a paraxial region thereof andan image-side surface 142 being convex in a paraxial region thereof,which are both aspheric, and the fourth lens element 140 is made ofplastic material.

The fifth lens element 150 with negative refractive power has anobject-side surface 151 being concave in a paraxial region thereof andan image-side surface 152 being convex in a paraxial region thereof,which are both aspheric, and the fifth lens element 150 is made ofplastic material.

The imaging lens system is further provided with an aperture stop 100disposed between an imaged object and the first lens element 110, and nolens element with refractive power is disposed between the aperture stop100 and the first lens element 110. The imaging lens system furtherincludes an IR-cut filter 160 located between the fifth lens element 150and an image surface 170. The IR-cut filter 160 is made of glass andwill not affect the focal length of the imaging lens system. The imagesensor 180 is disposed on or near the image surface 170 of the imaginglens system.

The equation of the aspheric surface profiles is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}\text{/}R} \right)\text{/}\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right)*\left( {Y\text{/}R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}{({Ai})*\left( Y^{i} \right)}}}},$

where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from the optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient.

In the first embodiment, a focal length of the imaging lens system is f,an f-number of the imaging 1 lens system is Fno, half of maximal fieldof view of the imaging lens system is HFOV, a maximum refractive indexamong the refractive indices of the first lens element 110, the secondlens element 120, the third lens element 130, the fourth lens element140 and the fifth lens element 150 is Nmax, and these parameters havethe following values: f=5.70 mm; Fno=2.82; HFOV=21.0 degrees;tan(2*HFOV)=0.900; and Nmax=1.650.

In the first embodiment, an Abbe number of the first lens element 110 isV1, an Abbe number of the second lens element 120 is V2, an Abbe numberof the third lens element 130 is V3, and they satisfy the condition:(V2+V3)/V1=0.77.

In the first embodiment, a central thickness of the third lens element130 is CT3, an axial distance between the third lens element 130 and thefourth lens element 140 is T34, and they satisfy the condition:CT3/T34=0.79.

In the first embodiment, the axial distance between the third lenselement 130 and the fourth lens element 140 is T34, a distance inparallel with the optical axis between a maximum effective radiusposition on the image-side surface 132 of the third lens element 130 anda maximum effective radius position on the object-side surface 141 ofthe fourth lens element 140 is ET34, and they satisfy the condition:T34/ET34=2.49.

In the first embodiment, an axial distance between the second lenselement 120 and the third lens element 130 is T23, an axial distancebetween the fourth lens element 140 and the fifth lens element 150 isT45, the axial distance between the third lens element 130 and thefourth lens element 140 is T34, and they satisfy the condition:(T23+T45)/T34=2.58.

In the first embodiment, the focal length of the imaging lens system isf, a curvature radius of the object-side surface 111 of the first lenselement 110 is R1, and they satisfy the condition: f/R1=4.01.

In the first embodiment, the focal length of the imaging lens system isf, a curvature radius of the image-side surface 142 of the fourth lenselement 140 is R8, and they satisfy the condition: f/R8=−0.42.

In the first embodiment, a curvature radius of the image-side surface152 of the fifth lens element 150 is R10, the curvature radius of theimage-side surface 142 of the fourth lens element 140 is R8, and theysatisfy the condition: R10/R8=0.77. In the first embodiment, a curvatureradius of the object-side surface 151 of the fifth lens element 150 isR9, the curvature radius of the image-side surface 152 of the fifth lenselement 150 is R10, and they satisfy the condition:(R9−R10)/(R9+R10)=−0.60.

In the first embodiment, a focal length of the fourth lens element 140is f4, a focal length of the fifth lens element 150 is f5, and theysatisfy the condition: f4/f5=2.23.

In the first embodiment, an axial distance between the aperture stop 100and the image-side surface 152 of the fifth lens element 150 is SD, anaxial distance between the object-side surface 111 of the first lenselement 110 and the image-side surface 152 of the fifth lens element 150is TD, and they satisfy the condition: SD/TD=0.90.

In the first embodiment, the focal length of the imaging lens system isf, a maximum image height of the imaging lens system is ImgH, and theysatisfy the condition: f/ImgH=2.56.

In the first embodiment, an entrance pupil diameter of the imaging lenssystem is EPD, the maximum image height of the imaging lens system isImgH, and they satisfy the condition: EPD/ImgH=0.91.

In the first embodiment, an axial distance between the object-sidesurface 111 of the first lens element 110 and the image surface 170 isTL, the focal length of the imaging lens system is f, and they satisfythe condition: TL/f=0.90.

In the first embodiment, the axial distance between the object-sidesurface 111 of the first lens element 110 and the image surface 170 isTL, and it has the following value: TL=5.15 mm.

The detailed optical data of the first embodiment are shown in TABLE 1,and the aspheric surface data are shown in TABLE 2, wherein the units ofthe curvature radius, the thickness and the focal length are expressedin mm, and HFOV is half of the maximal field of view.

TABLE 1 (Embodiment 1) f = 5.70 mm, Fno = 2.82, HFOV = 21.0 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe# Length 0Object Plano Infinity 1 Ape. Stop Plano −0.402 2 Lens 1 1.421 ASP 0.673Plastic 1.544 55.9 2.83 3 15.382 ASP 0.200 4 Lens 2 −56.204 ASP 0.360Plastic 1.650 21.4 −3.86 5 2.634 ASP 0.560 6 Lens 3 5.479 ASP 0.387Plastic 1.650 21.4 8.64 7 226.723 ASP 0.489 8 Lens 4 −4.855 ASP 0.300Plastic 1.535 55.7 −14.39 9 −13.426 ASP 0.704 10 Lens 5 −2.552 ASP 0.376Plastic 1.535 55.7 −6.44 11 −10.336 ASP 0.300 12 IR-cut filter Plano0.210 Glass 1.517 64.2 — 13 Plano 0.589 14 Image Surface Plano — Note:Reference Wavelength is d-line 587.6 nm

TABLE 2 Aspheric Coefficients Surface # 2 3 4 5 6 k= −3.5439E+00−1.5364E+01 −9.0000E+01  5.3973E+00 −4.4140E+01 A4=  1.4375E−01−1.1400E−01 −1.6725E−01 −8.6043E−02 −3.6838E−02 A6= −6.0563E−02 2.7274E−01  5.2020E−01  3.1738E−01  1.8101E−02 A8=  7.6480E−02−4.2547E−01 −8.4969E−01 −3.0109E−01  1.6749E−01 A10= −7.3668E−02 4.2317E−01  9.4347E−01  2.5742E−01 −1.1186E−01 A12=  4.0333E−02−2.2949E−01 −6.0549E−01 −1.3847E−01  1.9407E−02 A14= −7.9060E−03 5.0980E−02  1.5907E−01  6.1861E−03 Surface # 7 8 9 10 11 k= −9.0000E+01 8.3290E+00  8.2748E+01  9.3541E−01  1.2006E+01 A4= −1.0293E−01−1.0880E−01  1.6490E−02 −1.0835E−02 −7.8244E−02 A6=  3.9109E−02−1.6852E−01 −1.2161E−01  3.2065E−02  3.4103E−02 A8=  8.8015E−02 2.6037E−01  2.0451E−01 −1.2601E−02 −1.1536E−02 A10=  1.7266E−02−3.9952E−02 −1.2256E−01  9.7840E−03  3.0066E−03 A12= −1.8915E−02−6.7074E−02  3.1877E−02 −3.5677E−03 −4.6566E−04 A14=  2.4964E−02−3.2024E−03  4.5561E−04  3.5349E−05

2nd Embodiment

FIG. 2A is a schematic view of an image capturing device according tothe 2nd embodiment of the present disclosure. FIG. 2B shows, in orderfrom left to right, longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 2nd embodiment.

In FIG. 2A, the image capturing device includes an imaging lens system(not otherwise herein labeled) of the present disclosure and an imagesensor 280. The imaging lens system includes, in order from an objectside to an image side, a first lens element 210, a second lens element220, a third lens element 230, a fourth lens element 240, and a fifthlens element 250, wherein the imaging lens system has a total of fivelens elements (210-250) with refractive power.

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex in a paraxial region thereof and animage-side surface 212 being concave in a paraxial region thereof, whichare both aspheric, and the first lens element 210 is made of plasticmaterial.

The second lens element 220 with negative refractive power has anobject-side surface 221 being convex in a paraxial region thereof and animage-side surface 222 being concave in a paraxial region thereof, whichare both aspheric, and the second lens element 220 is made of plasticmaterial.

The third lens element 230 with positive refractive power has anobject-side surface 231 being concave in a paraxial region thereof andan image-side surface 232 being convex in a paraxial region thereof,which are both aspheric, and the third lens element 230 is made ofplastic material. Furthermore, each of the object-side surface 231 andthe image-side surface 232 of the third lens element 230 has at leastone inflection point.

The fourth lens element 240 with negative refractive power has anobject-side surface 241 being concave in a paraxial region thereof andan image-side surface 242 being concave in a paraxial region thereof,which are both aspheric, and the fourth lens element 240 is made ofplastic material.

The fifth lens element 250 with negative refractive power has anobject-side surface 251 being concave in a paraxial region thereof andan image-side surface 252 being convex in a paraxial region thereof,which are both aspheric, and the fifth lens element 250 is made ofplastic material.

The imaging lens system is further provided with an aperture stop 200disposed between an imaged object and the first lens element 210, and nolens element with refractive power is disposed between the aperture stop200 and the first lens element 210. The imaging lens system furtherincludes an IR-cut filter 260 located between the fifth lens element 250and an image surface 270. The IR-cut filter 260 is made of glass andwill not affect the focal length of the imaging lens system. The imagesensor 280 is disposed on or near the image surface 270 of the imaginglens system.

The detailed optical data of the second embodiment are shown in TABLE 3,and the aspheric surface data are shown in TABLE 4, wherein the units ofthe curvature radius, the thickness and the focal length are expressedin mm, and HFOV is half of the maximal field of view.

TABLE 3 (Embodiment 2) f = 7.01 mm, Fno = 2.82, HFOV = 17.2 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Ape. Stop Plano −0.539 2 Lens 1 1.686 ASP0.902 Plastic 1.544 55.9 3.23 3 33.669 ASP 0.200 4 Lens 2 25.778 ASP0.480 Plastic 1.650 21.4 −4.50 5 2.604 ASP 0.820 6 Lens 3 −150.369 ASP0.393 Plastic 1.650 21.4 11.42 7 −7.076 ASP 0.393 8 Lens 4 −5.194 ASP0.300 Plastic 1.535 55.7 −9.09 9 77.399 ASP 0.999 10 Lens 5 −2.513 ASP0.566 Plastic 1.535 55.7 −16.14 11 −3.823 ASP 0.300 12 IR-cut filterPlano 0.210 Glass 1.517 64.2 — 13 Plano 0.683 14 Image Surface Plano —Note: Reference wavelength is d-line 587.6 nm

TABLE 4 Aspheric Coefficients Surface # 2 3 4 5 6 k= −5.2429E+00−3.5690E+01 −9.0000E+01   5.2455E+00 −9.0000E+01 A4=  1.2327E−01−1.1840E−01 −1.7225E−01 −9.8150E−02 −6.1368E−02 A6= −6.7246E−02 2.9326E−01  5.1492E−01  2.7713E−01  5.6028E−03 A8=  7.7497E−02−4.2076E−01 −8.4676E−01 −3.1811E−01  1.6829E−01 A10= −7.2101E−02 4.2140E−01  9.4727E−01  2.4628E−01 −1.0807E−01 A12=  4.0658E−02−2.3188E−01 −6.0545E−01 −1.4301E−01  1.8915E−02 A14= −8.8108E−03 4.9883E−02  1.5449E−01  9.0578E−03 Surface # 7 8 9 10 11 k= −3.0961E+01 6.4184E+00 −9.0000E+01  9.2207E−01  1.4504E+00 A4= −1.1799E−01−9.9168E−02  3.7169E−03 −3.3735E−02 −7.1562E−02 A6=  1.6919E−02−1.6075E−01 −1.1982E−01  3.4833E−02  3.2972E−02 A8=  8.2853E−02 2.5737E−01  2.0491E−01 −1.2486E−02 −1.0747E−02 A10=  1.5261E−02−4.2337E−02 −1.2241E−01  9.8254E−03  3.0557E−03 A12= −1.9074E−02−6.6913E−02  3.1909E−02 −3.5615E−03 −4.9292E−04 A14=  2.6262E−02−3.2030E−03  4.5380E−04  2.2307E−05

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in Table 5below are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4and satisfy the conditions stated in Table 5.

TABLE 5 2^(nd) Embodiment f [mm] 7.01 f/R8 0.09 Fno 2.82 R10/R8 −0.05HFOV [deg.] 17.2 (R9 − R10)/(R9 + R10) −0.21 tan(2*HFOV) 0.685 f4/f50.56 Nmax 1.650 SD/TD 0.89 (V2 + V3)/V1 0.77 f/ImgH 3.14 CT3/T34 1.00EPD/ImgH 1.11 T34/ET34 2.05 TL/f 0.89 (T23 + T45)/T34 4.63 TL [mm] 6.25f/R1 4.16

3rd Embodiment

FIG. 3A is a schematic view of an image capturing device according tothe 3rd embodiment of the present disclosure. FIG. 3B shows, in orderfrom left to right, longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 3rd embodiment.

In FIG. 3A, the image capturing device includes an imaging lens system(not otherwise herein labeled) of the present disclosure and an imagesensor 380. The imaging lens system includes, in order from an objectside to an image side, a first lens element 310, a second lens element320, a third lens element 330, a fourth lens element 340, and a fifthlens element 350, wherein the imaging lens system has a total of fivelens elements (310-350) with refractive power.

The first lens element 310 with positive refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being convex in a paraxial region thereof, whichare both aspheric, and the first lens element 310 is made of plasticmaterial.

The second lens element 320 with negative refractive power has anobject-side surface 321 being concave in a paraxial region thereof andan image-side surface 322 being concave in a paraxial region thereof,which are both aspheric, and the second lens element 320 is made ofplastic material.

The third lens element 330 with positive refractive power has anobject-side surface 331 being convex in a paraxial region thereof and animage-side surface 332 being concave in a paraxial region thereof, whichare both aspheric, and the third lens element 330 is made of plasticmaterial. Furthermore, the image-side surface 332 of the third lenselement 330 has at least one inflection point.

The fourth lens element 340 with negative refractive power has anobject-side surface 341 being concave in a paraxial region thereof andan image-side surface 342 being convex in a paraxial region thereof,which are both aspheric, and the fourth lens element 340 is made ofplastic material.

The fifth lens element 350 with negative refractive power has anobject-side surface 351 being concave in a paraxial region thereof andan image-side surface 352 being convex in a paraxial region thereof,which are both aspheric, and the fifth lens element 350 is made ofplastic material.

The imaging lens system is further provided with an aperture stop 300disposed between the first lens element 310 and the second lens element320, and no lens element with refractive power is disposed between theaperture stop 300 and the first lens element 310. The imaging lenssystem further includes an IR-cut filter 360 located between the fifthlens element 350 and an image surface 370. The IR-cut filter 360 is madeof glass and will not affect the focal length of the imaging lenssystem.

The image sensor 380 is disposed on or near the image surface 370 of theimaging lens system.

The detailed optical data of the third embodiment are shown in TABLE 6,and the aspheric surface data are shown in TABLE 7, wherein the units ofthe curvature radius, the thickness and the focal length are expressedin mm, and HFOV is half of the maximal field of view.

TABLE 6 (Embodiment 3) f = 6.83 mm, Fno = 2.82, HFOV = 22.0 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Lens 1 1.666 ASP 0.907 Plastic 1.544 55.9 2.962 −39.891 ASP 0.100 3 Ape. Stop Plano −0.003 4 Lens 2 −53.624 ASP 0.419Plastic 1.639 23.5 −4.02 5 2.706 ASP 0.620 6 Lens 3 6.620 ASP 0.385Plastic 1.639 23.5 12.41 7 39.183 ASP 0.443 8 Lens 4 −6.274 ASP 0.322Plastic 1.544 55.9 −15.80 9 −23.638 ASP 0.880 10 Lens 5 −3.072 ASP 0.993Plastic 1.535 55.7 −7.19 11 −17.008 ASP 0.300 12 IR-cut filter Plano0.210 Glass 1.517 64.2 — 13 Plano 0.622 14 Image Surface Plano — Note:Reference wavelength is d-line 587.6 nm

TABLE 7 Aspheric Coefficients Surface # 1 2 4 5 6 k= −4.9409E+00 9.0000E+01 −9.0000E+01  5.6216E+00 −9.5323E+00 A4=  1.2613E−01−1.1935E−01 −1.6818E−01 −9.2844E−02 −7.2783E−02 A6= −7.0846E−02 2.9595E−01  5.2275E−01  2.6593E−01  1.8173E−03 A8=  7.6069E−02−4.2127E−01 −8.4007E−01 −3.2143E−01  1.7073E−01 A10= −7.2492E−02 4.2057E−01  9.4920E−01  2.8766E−01 −1.0773E−01 A12=  4.0424E−02−2.3221E−01 −6.0538E−01 −1.2890E−01  1.8381E−02 A14= −9.0161E−03 4.9965E−02  1.5469E−01 −1.6472E−02 Surface # 7 8 9 10 11 k= −6.5512E+01 1.5038E+01  3.8511E+01  1.4128E+00  5.7218E+01 A4= −1.1246E−01−9.8141E−02 −3.1008E−02 −6.2818E−02 −8.2969E−02 A6=  1.8395E−02−1.7138E−01 −1.2248E−01  2.0714E−02  2.6804E−02 A8=  8.1164E−02 2.5567E−01  2.0483E−01 −1.2015E−02 −9.7695E−03 A10=  1.3559E−02−4.0690E−02 −1.2192E−01  1.0757E−02  2.9969E−03 A12= −2.0640E−02−6.6785E−02  3.2118E−02 −3.5659E−03 −5.1384E−04 A14=  2.5663E−02−3.2369E−03  3.8077E−04  3.5057E−05

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in Table 8below are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 6 and Table 7and satisfy the conditions stated in Table 8.

TABLE 8 3^(rd) Embodiment f [mm] 6.83 f/R8 −0.29 Fno 2.82 R10/R8 0.72HFOV [deg.] 22.0 (R9 − R10)/(R9 + R10) −0.69 tan(2*HFOV) 0.966 f4/f52.20 Nmax 1.639 SD/TD 0.80 (V2 + V3)/V1 0.84 f/ImgH 2.41 CT3/T34 0.87EPD/ImgH 0.86 T34/ET34 4.31 TL/f 0.91 (T23 + T45)/T34 3.39 TL [mm] 6.20f/R1 4.10

4th Embodiment

FIG. 4A is a schematic view of an image capturing device according tothe 4th embodiment of the present disclosure. FIG. 4B shows, in orderfrom left to right, longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 4th embodiment.

In FIG. 4A, the image capturing device includes an imaging lens system(not otherwise herein labeled) of the present disclosure and an imagesensor 480. The imaging lens system includes, in order from an objectside to an image side, a first lens element 410, a second lens element420, a third lens element 430, a fourth lens element 440, and a fifthlens element 450, wherein the imaging lens system has a total of fivelens elements (410-450) with refractive power.

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being concave in a paraxial region thereof, whichare both aspheric, and the first lens element 410 is made of plasticmaterial.

The second lens element 420 with negative refractive power has anobject-side surface 421 being concave in a paraxial region thereof andan image-side surface 422 being concave in a paraxial region thereof,which are both aspheric, and the second lens element 420 is made ofplastic material.

The third lens element 430 with positive refractive power has anobject-side surface 431 being convex in a paraxial region thereof and animage-side surface 432 being convex in a paraxial region thereof, whichare both aspheric, and the third lens element 430 is made of plasticmaterial. Furthermore, the image-side surface 432 of the third lenselement 430 has at least one inflection point.

The fourth lens element 440 with negative refractive power has anobject-side surface 441 being concave in a paraxial region thereof andan image-side surface 442 being convex in a paraxial region thereof,which are both aspheric, and the fourth lens element 440 is made ofplastic material.

The fifth lens element 450 with negative refractive power has anobject-side surface 451 being concave in a paraxial region thereof andan image-side surface 452 being convex in a paraxial region thereof,which are both aspheric, and the fifth lens element 450 is made ofplastic material.

The imaging lens system is further provided with an aperture stop 400disposed between an imaged object and the first lens element 410, and nolens element with refractive power is disposed between the aperture stop400 and the first lens element 410. The imaging lens system furtherincludes an IR-cut filter 460 located between the fifth lens element 450and an image surface 470. The IR-cut filter 460 is made of glass andwill not affect the focal length of the imaging lens system. The imagesensor 480 is disposed on or near the image surface 470 of the imaginglens system.

The detailed optical data of the fourth embodiment are shown in TABLE 9,and the aspheric surface data are shown in TABLE 10, wherein the unitsof the curvature radius, the thickness and the focal length areexpressed in mm, and HFOV is half of the maximal field of view.

TABLE 9 (Embodiment 4) f = 5.67 mm, Fno = 2.75, HFOV = 21.0 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Ape. Stop Plano −0.454 2 Lens 1 1.346 ASP0.723 Plastic 1.535 55.7 2.75 3 12.631 ASP 0.200 4 Lens 2 −56.028 ASP0.300 Plastic 1.650 21.4 −3.82 5 2.601 ASP 0.467 6 Lens 3 6.200 ASP0.352 Plastic 1.650 21.4 8.58 7 −54.235 ASP 0.409 8 Lens 4 −4.023 ASP0.300 Plastic 1.535 55.7 −11.21 9 −12.539 ASP 0.819 10 Lens 5 −2.529 ASP0.430 Plastic 1.650 21.4 −7.07 11 −6.001 ASP 0.300 12 IR-cut filterPlano 0.210 Glass 1.517 64.2 — 13 Plano 0.592 14 Image Surface Plano —Note: Reference wavelength is d-line 587.6 nm

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 6 k = −3.2716E+00  9.0447E+00 −9.0000E+01   5.7774E+00 −9.0000E+01 A4 =   1.5281E−01−1.1364E−01 −1.6509E−01 −7.5323E−02 −2.6850E−02 A6 = −5.4494E−02  2.6444E−01   5.2215E−01   3.2358E−01   1.3283E−02 A8 =   7.5892E−02−4.2437E−01 −8.5278E−01 −3.0769E−01   1.6049E−01 A10 = −7.4691E−02  4.2551E−01   9.4207E−01   2.5409E−01 −1.1328E−01 A12 =   4.0083E−02−2.2902E−01 −6.0447E−01 −1.2377E−01   2.0060E−02 A14 = −7.4681E−03  4.9277E−02   1.6157E−01   4.9511E−02 Surface # 7 8 9 10 11 k =−2.0005E+01 −3.7328E+00   8.4874E+01   1.1050E+00   9.1787E+00 A4 =−1.0276E−01 −1.0413E−01   2.7757E−02 −6.1099E−02 −1.0450E−01 A6 =  5.5707E−02 −1.6627E−01 −1.2399E−01   3.2981E−02   3.8340E−02 A8 =  8.7292E−02   2.7029E−01   1.9859E−01 −1.3041E−02 −1.1911E−02 A10 =  1.6893E−02 −3.8917E−02 −1.2253E−01   9.5289E−03   2.9380E−03 A12 =−1.9632E−02 −6.7163E−02   3.2266E−02 −3.6212E−03 −4.9095E−04 A14 =  2.4584E−02 −2.9495E−03   4.4794E−04   2.1094E−05

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in Table 11below are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10and satisfy the conditions stated in Table 11.

TABLE 11 4^(th) Embodiment f [mm] 5.67 f/R8 −0.45 Fno 2.75 R10/R8 0.48HFOV [deg.] 21.0 (R9 − R10)/(R9 + R10) −0.41 tan(2*HFOV) 0.900 f4/f51.58 Nmax 1.650 SD/TD 0.89 (V2 + V3)/V1 0.77 f/ImgH 2.54 CT3/T34 0.86EPD/ImgH 0.92 T34/ET34 2.28 TL/f 0.90 (T23 + T45)/T34 3.14 TL [mm] 5.10f/R1 4.21

5th Embodiment

FIG. 5A is a schematic view of an image capturing device according tothe 5th embodiment of the present disclosure. FIG. 5B shows, in orderfrom left to right, longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 5th embodiment.

In FIG. 5A, the image capturing device includes an imaging lens system(not otherwise herein labeled) of the present disclosure and an imagesensor 580. The imaging lens system includes, in order from an objectside to an image side, a first lens element 510, a second lens element520, a third lens element 530, a fourth lens element 540, and a fifthlens element 550, wherein the imaging lens system has a total of fivelens elements (510-550) with refractive power.

The first lens element 510 with positive refractive power has anobject-side surface 511 being convex in a paraxial region thereof and animage-side surface 512 being convex in a paraxial region thereof, whichare both aspheric, and the first lens element 510 is made of plasticmaterial.

The second lens element 520 with negative refractive power has anobject-side surface 521 being concave in a paraxial region thereof andan image-side surface 522 being concave in a paraxial region thereof,which are both aspheric, and the second lens element 520 is made ofplastic material.

The third lens element 530 with positive refractive power has anobject-side surface 531 being convex in a paraxial region thereof and animage-side surface 532 being concave in a paraxial region thereof, whichare both aspheric, and the third lens element 530 is made of plasticmaterial. Furthermore, the image-side surface 532 of the third lenselement 530 has at least one inflection point.

The fourth lens element 540 with negative refractive power has anobject-side surface 541 being concave in a paraxial region thereof andan image-side surface 542 being concave in a paraxial region thereof,which are both aspheric, and the fourth lens element 540 is made ofplastic material.

The fifth lens element 550 with negative refractive power has anobject-side surface 551 being concave in a paraxial region thereof andan image-side surface 552 being convex in a paraxial region thereof,which are both aspheric, and the fifth lens element 550 is made ofplastic material.

The imaging lens system is further provided with an aperture stop 500disposed between the first lens element 510 and the second lens element520, and no lens element with refractive power is disposed between theaperture stop 500 and the first lens element 510. The imaging lenssystem further includes an IR-cut filter 560 located between the fifthlens element 550 and an image surface 570. The IR-cut filter 560 is madeof glass and will not affect the focal length of the imaging lenssystem. The image sensor 580 is disposed on or near the image surface570 of the imaging lens system.

The detailed optical data of the fifth embodiment are shown in TABLE 12,and the aspheric surface data are shown in TABLE 13, wherein the unitsof the curvature radius, the thickness and the focal length areexpressed in mm, and HFOV is half of the maximal field of view.

TABLE 12 (Embodiment 5) f = 7.13 mm, Fno = 2.82, HFOV = 19.0 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Lens 1 1.665 ASP 0.957 Plastic 1.544 55.9 3.022 −112.370 ASP 0.100 3 Ape. Stop Plano −0.018 4 Lens 2 −118.385 ASP0.313 Plastic 1.639 23.5 −4.07 5 2.660 ASP 0.671 6 Lens 3 6.926 ASP0.424 Plastic 1.639 23.5 11.58 7 105.471 ASP 0.596 8 Lens 4 −6.127 ASP0.300 Plastic 1.544 55.9 −10.80 9 146.368 ASP 1.163 10 Lens 5 −2.485 ASP0.535 Plastic 1.535 55.7 −7.88 11 −6.508 ASP 0.300 12 IR-cut filterPlano 0.210 Glass 1.517 64.2 — 13 Plano 0.641 14 Image Surface Plano —Note: Reference wavelength is d-line 587.6 nm

TABLE 13 Aspheric Coefficients Surface # 1 2 4 5 6 k = −5.1391E+00−9.0000E+01 −9.0000E+01   5.2125E+00   8.9897E+00 A4 =   1.3136E−01−1.1634E−01 −1.6267E−01 −8.0311E−02 −6.4910E−02 A6 = −6.9842E−02  2.9697E−01   5.2503E−01   2.7615E−01   2.6779E−03 A8 =   7.5535E−02−4.2120E−01 −8.3915E−01 −3.1062E−01   1.6944E−01 A10 = −7.2737E−02  4.2028E−01   9.4930E−01   2.8257E−01 −1.0712E−01 A12 =   4.0547E−02−2.3254E−01 −6.0646E−01 −1.3380E−01   1.9231E−02 A14 = −8.7919E−03  4.9679E−02   1.5252E−01 −1.3059E−02 Surface # 7 8 9 10 11 k =−9.0000E+01   3.2314E+00   9.0000E+01   9.3680E−01   8.5844E+00 A4 =−1.0014E−01 −8.2511E−02   5.1580E−03 −2.3050E−02 −7.6895E−02 A6 =  1.7965E−02 −1.6511E−01 −1.1917E−01   2.8865E−02   3.5085E−02 A8 =  8.0595E−02   2.5622E−01   2.0478E−01 −1.3078E−02 −1.1031E−02 A10 =  1.3346E−02 −4.0621E−02 −1.2247E−01   9.6413E−03   2.9452E−03 A12 =−2.0164E−02 −6.7256E−02   3.1964E−02 −3.6377E−03 −5.1055E−04 A14 =  2.4794E−02 −3.1277E−03   5.2187E−04   3.3365E−05

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in Table 14below are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 12 and Table 13and satisfy the conditions stated in Table 14.

TABLE 14 Embodiment 5 f [mm] 7.13 f/R8 0.05 Fno 2.82 R10/R8 −0.04 HFOV[deg.] 19.0 (R9 − R10)/(R9 + R10) −0.45 tan(2*HFOV) 0.781 f4/f5 1.37Nmax 1.639 SD/TD 0.79 (V2 + V3)/V1 0.84 f/ImgH 2.82 CT3/T34 0.71EPD/ImgH 1.00 T34/ET34 1.87 TL/f 0.87 (T23 + T45)/T34 3.08 TL [mm] 6.19f/R1 4.28

6th Embodiment

FIG. 6A is a schematic view of an image capturing device according tothe 6th embodiment of the present disclosure. FIG. 6B shows, in orderfrom left to right, longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 6th embodiment.

In FIG. 6A, the image capturing device includes an imaging lens system(not otherwise herein labeled) of the present disclosure and an imagesensor 680. The imaging lens system includes, in order from an objectside to an image side, a first lens element 610, a second lens element620, a third lens element 630, a fourth lens element 640, and a fifthlens element 650, wherein the imaging lens system has a total of fivelens elements (610-650) with refractive power.

The first lens element 610 with positive refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being concave in a paraxial region thereof, whichare both aspheric, and the first lens element 610 is made of plasticmaterial.

The second lens element 620 with negative refractive power has anobject-side surface 621 being convex in a paraxial region thereof and animage-side surface 622 being concave in a paraxial region thereof, whichare both aspheric, and the second lens element 620 is made of plasticmaterial.

The third lens element 630 with negative refractive power has anobject-side surface 631 being convex in a paraxial region thereof and animage-side surface 632 being concave in a paraxial region thereof, whichare both aspheric, and the third lens element 630 is made of plasticmaterial. Furthermore, the image-side surface 632 of the third lenselement 630 has at least one inflection point.

The fourth lens element 640 with negative refractive power has anobject-side surface 641 being concave in a paraxial region thereof andan image-side surface 642 being convex in a paraxial region thereof,which are both aspheric, and the fourth lens element 640 is made ofplastic material.

The fifth lens element 650 with negative refractive power has anobject-side surface 651 being concave in a paraxial region thereof andan image-side surface 652 being convex in a paraxial region thereof,which are both aspheric, and the fifth lens element 650 is made ofplastic material.

The imaging lens system is further provided with an aperture stop 600disposed between an imaged object and the first lens element 610, and nolens element with refractive power is disposed between the aperture stop600 and the first lens element 610. The imaging lens system furtherincludes an IR-cut filter 660 located between the fifth lens element 650and an image surface 670. The IR-cut filter 660 is made of glass andwill not affect the focal length of the imaging lens system. The imagesensor 680 is disposed on or near the image surface 670 of the imaginglens system.

The detailed optical data of the sixth embodiment are shown in TABLE 15,and the aspheric surface data are shown in TABLE 16, wherein the unitsof the curvature radius, the thickness and the focal length areexpressed in mm, and HFOV is half of the maximal field of view.

TABLE 15 (Embodiment 6) f = 5.99 mm, Fno = 2 80, HFOV = 20.0 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Ape. Stop Plano −0.483 2 Lens 1 1.377 ASP0.716 Plastic 1.544 55.9 2.99 3 7.321 ASP 0.200 4 Lens 2 9.425 ASP 0.360Plastic 1.650 21.4 −5.83 5 2.661 ASP 0.405 6 Lens 3 3.074 ASP 0.390Plastic 1.544 55.9 −17.58 7 2.222 ASP 0.322 8 Lens 4 −13.629 ASP 0.424Plastic 1.650 21.4 −241.45 9 −15.109 ASP 0.633 10 Lens 5 −2.673 ASP1.000 Plastic 1.650 21.4 −17.78 11 −3.990 ASP 0.300 12 IR-cut filterPlano 0.210 Glass 1.517 64.2 — 13 Plano 0.589 14 Image Surface Plano —Note: Reference wavelength is d-line 587.6 nm

TABLE 16 Aspheric Coefficients Surface # 2 3 4 5 6 k = −3.2117E+00  1.9927E+01   7.7586E+01   7.3259E+00 −3.8573E+01 A4 =   1.4312E−01−1.1009E−01 −1.4375E−01 −7.4318E−02 −4.4185E−02 A6 = −5.6992E−02  2.6849E−01   5.1115E−01   3.2404E−01   1.3068E−02 A8 =   7.7259E−02−4.2289E−01 −8.4850E−01 −2.0996E−01   1.6035E−01 A10 = −7.3333E−02  4.2527E−01   9.4810E−01   1.7549E−01 −1.1342E−01 A12 =   4.0580E−02−2.2932E−01 −6.0561E−01 −1.6513E−01   1.9941E−02 A14 = −7.6642E−03  4.9670E−02   1.5162E−01   1.6158E−01 Surface # 7 8 9 10 11 k =−9.1776E+00   9.0000E+01   9.0000E+01   2.2088E+00   1.5287E+00 A4 =−1.1625E−01 −7.0481E−02   3.4386E−03 −6.6382E−02 −8.4166E−02 A6 =  3.5027E−02 −2.1485E−01 −1.2301E−01   3.0921E−02   2.9545E−02 A8 =  7.7460E−02   2.5489E−01   1.9832E−01 −1.2877E−02 −1.1419E−02 A10 =  1.2882E−02 −4.4808E−02 −1.2119E−01   9.5510E−03   2.9094E−03 A12 =−4.8393E−02 −7.1269E−02   3.3164E−02 −3.6212E−03 −5.4096E−04 A14 =  2.2712E−02 −2.4835E−03   1.4846E−03   4.1684E−05

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in Table 17below are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16and satisfy the conditions stated in Table 17.

TABLE 17 6^(th) Embodiment f [mm] 5.99 f/R8 −0.40 Fno 2.80 R10/R8 0.26HFOV [deg.] 20.0 (R9 − R10)/(R9 + R10) −0.20 tan(2*HFOV) 0.839 f4/f513.58 Nmax 1.650 SD/TD 0.89 (V2 + V3)/V1 1.38 f/ImgH 2.68 CT3/T34 1.21EPD/ImgH 0.96 T34/ET34 6.39 TL/f 0.93 (T23 + T45)/T34 3.22 TL [mm] 5.55f/R1 4.35

7th Embodiment

FIG. 7A is a schematic view of an image capturing device according tothe 7th embodiment of the present disclosure. FIG. 7B shows, in orderfrom left to right, longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 7th embodiment.

In FIG. 7A, the image capturing device includes an imaging lens system(not otherwise herein labeled) of the present disclosure and an imagesensor 780. The imaging lens system includes, in order from an objectside to an image side, a first lens element 710, a second lens element720, a third lens element 730, a fourth lens element 740, and a fifthlens element 750, wherein the imaging lens system has a total of fivelens elements (710-750) with refractive power.

The first lens element 710 with positive refractive power has anobject-side surface 711 being convex in a paraxial region thereof and animage-side surface 712 being concave in a paraxial region thereof, whichare both aspheric, and the first lens element 710 is made of plasticmaterial.

The second lens element 720 with negative refractive power has anobject-side surface 721 being convex in a paraxial region thereof and animage-side surface 722 being concave in a paraxial region thereof, whichare both aspheric, and the second lens element 720 is made of plasticmaterial.

The third lens element 730 with negative refractive power has anobject-side surface 731 being convex in a paraxial region thereof and animage-side surface 732 being concave in a paraxial region thereof, whichare both aspheric, and the third lens element 730 is made of plasticmaterial.

The fourth lens element 740 with positive refractive power has anobject-side surface 741 being convex in a paraxial region thereof and animage-side surface 742 being convex in a paraxial region thereof, whichare both aspheric, and the fourth lens element 740 is made of plasticmaterial.

The fifth lens element 750 with negative refractive power has anobject-side surface 751 being concave in a paraxial region thereof andan image-side surface 752 being convex in a paraxial region thereof,which are both aspheric, and the fifth lens element 750 is made ofplastic material.

The imaging lens system is further provided with an aperture stop 700disposed between an imaged object and the first lens element 710, and nolens element with refractive power is disposed between the aperture stop700 and the first lens element 710. The imaging lens system furtherincludes an IR-cut filter 760 located between the fifth lens element 750and an image surface 770. The IR-cut filter 760 is made of glass andwill not affect the focal length of the imaging lens system. The imagesensor 780 is disposed on or near the image surface 770 of the imaginglens system.

The detailed optical data of the seventh embodiment are shown in TABLE18, and the aspheric surface data are shown in TABLE 19, wherein theunits of the curvature radius, the thickness and the focal length areexpressed in mm, and HFOV is half of the maximal field of view.

TABLE 18 (Embodiment 7) f = 6.00 mm, Fno = 2.70, HFOV = 20.0 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Ape. Stop Plano −0.512 2 Lens 1 1.390 ASP0.761 Plastic 1.544 55.9 2.97 3 7.965 ASP 0.200 4 Lens 2 10.132 ASP0.323 Plastic 1.650 21.4 −5.53 5 2.620 ASP 0.395 6 Lens 3 3.635 ASP0.386 Plastic 1.544 55.9 −11.66 7 2.225 ASP 0.248 8 Lens 4 29.292 ASP0.354 Plastic 1.650 21.4 13.64 9 −12.645 ASP 0.733 10 Lens 5 −2.589 ASP1.000 Plastic 1.650 21.4 −7.61 11 −6.262 ASP 0.300 — 12 IR-cut filterPlano 0.210 Glass 1.517 64.2 — 13 Plano 0.590 14 Image Surface Plano —Note: Reference wavelength is d-line 587.6 nm

TABLE 19 Aspheric Coefficients Surface # 2 3 4 5 6 k = −3.2239E+00  1.5290E+01   7.9629E+01   7.0171E+00 −9.0000E+01 A4 =   1.4250E−01−1.1301E−01 −1.5660E−01 −7.4315E−02 −2.9217E−02 A6 = −5.7129E−02  2.6651E−01   5.1464E−01   3.2404E−01   1.3065E−02 A8 =   7.7263E−02−4.2341E−01 −8.5096E−01 −2.1687E−01   1.6035E−01 A10 = −7.3330E−02  4.2572E−01   9.4572E−01   2.1269E−01 −1.1342E−01 A12 =   4.0621E−02−2.2888E−01 −6.0571E−01 −1.7233E−01   1.9941E−02 A14 = −7.5905E−03  4.9695E−02   1.5376E−01   8.6732E−02 Surface # 7 8 9 10 11 k =−1.6462E+01   9.0000E+01   8.9547E+01   2.2965E+00   5.1296E+00 A4 =−1.0280E−01 −6.8136E−02   2.5566E−02 −6.7369E−02 −8.7911E−02 A6 =  5.3550E−02 −1.7039E−01 −1.2301E−01   3.0913E−02   2.9413E−02 A8 =  8.6923E−02   2.6702E−01   1.9962E−01 −1.2877E−02 −1.1019E−02 A10 =  1.6726E−02 −3.9797E−02 −1.2208E−01   9.5510E−03   2.9822E−03 A12 =−4.5035E−02 −6.8867E−02   3.2143E−02 −3.6212E−03 −5.0165E−04 A14 =  2.4255E−02 −3.2206E−03   1.1188E−03   3.3399E−05

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in Table 20below are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 18 and Table 19and satisfy the conditions stated in Table 20.

TABLE 20 7^(th) Embodiment f [mm] 6.00 f/R8 −0.47 Fno 2.70 R10/R8 0.50HFOV [deg.] 20.0 (R9 − R10)/(R9 + R10) −0.41 tan(2*HFOV) 0.839 f4/f5−1.79 Nmax 1.650 SD/TD 0.88 (V2 + V3)/V1 1.38 f/ImgH 2.69 CT3/T34 1.56EPD/ImgH 0.99 T34/ET34 4.72 TL/f 0.92 (T23 + T45)/T34 4.55 TL [mm] 5.50f/R1 4.31

8th Embodiment

FIG. 8A is a schematic view of an image capturing device according tothe 8th embodiment of the present disclosure. FIG. 8B shows, in orderfrom left to right, longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 8th embodiment.

In FIG. 8A, the image capturing device includes an imaging lens system(not otherwise herein labeled) of the present disclosure and an imagesensor 880. The imaging lens system includes, in order from an objectside to an image side, a first lens element 810, a second lens element820, a third lens element 830, a fourth lens element 840, and a fifthlens element 850, wherein the imaging lens system has a total of fivelens elements (810-850) with refractive power.

The first lens element 810 with positive refractive power has anobject-side surface 811 being convex in a paraxial region thereof and animage-side surface 812 being concave in a paraxial region thereof, whichare both aspheric, and the first lens element 810 is made of plasticmaterial.

The second lens element 820 with negative refractive power has anobject-side surface 821 being convex in a paraxial region thereof and animage-side surface 822 being concave in a paraxial region thereof, whichare both aspheric, and the second lens element 820 is made of plasticmaterial.

The third lens element 830 with positive refractive power has anobject-side surface 831 being convex in a paraxial region thereof and animage-side surface 832 being concave in a paraxial region thereof, whichare both aspheric, and the third lens element 830 is made of plasticmaterial. Furthermore, the image-side surface 832 of the third lenselement 830 has at least one inflection point.

The fourth lens element 840 with negative refractive power has anobject-side surface 841 being concave in a paraxial region thereof andan image-side surface 842 being convex in a paraxial region thereof,which are both aspheric, and the fourth lens element 840 is made ofplastic material.

The fifth lens element 850 with negative refractive power has anobject-side surface 851 being concave in a paraxial region thereof andan image-side surface 852 being convex in a paraxial region thereof,which are both aspheric, and the fifth lens element 850 is made ofplastic material.

The imaging lens system is further provided with an aperture stop 800disposed between an imaged object and the first lens element 810, and nolens element with refractive power is disposed between the aperture stop800 and the first lens element 810. The imaging lens system furtherincludes an IR-cut filter 860 located between the fifth lens element 850and an image surface 870. The IR-cut filter 860 is made of glass andwill not affect the focal length of the imaging lens system. The imagesensor 880 is disposed on or near the image surface 870 of the imaginglens system.

The detailed optical data of the eighth embodiment are shown in TABLE21, and the aspheric surface data are shown in TABLE 22, wherein theunits of the curvature radius, the thickness and the focal length areexpressed in mm, and HFOV is half of the maximal field of view.

TABLE 21 (Embodiment 8) f = 5.84 mm, Fno = 2.60, HFOV = 20.5 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Ape. Stop Plano −0.550 2 Lens 1 1.370 ASP0.781 Plastic 1.544 55.9 2.94 3 7.581 ASP 0.200 4 Lens 2 10.873 ASP0.319 Plastic 1.650 21.4 −5.35 5 2.602 ASP 0.418 6 Lens 3 4.269 ASP0.314 Plastic 1.544 55.9 19.49 7 6.960 ASP 0.364 8 Lens 4 −4.437 ASP0.300 Plastic 1.544 55.9 −13.04 9 −12.124 ASP 0.428 10 Lens 5 −2.761 ASP1.175 Plastic 1.650 21.4 −9.49 11 −5.835 ASP 0.300 12 IR-cut filterPlano 0.210 Glass 1.517 64.2 — 13 Plano 0.594 14 Image Surface Plano —Note: Reference wavelength is 587.6 nm

TABLE 22 Aspheric Coefficients Surface # 2 3 4 5 6 k = −3.2453E+00  1.5831E+01   8.3153E+01   6.8904E+00 −6.2459E+01 A4 =   1.4504E−01−1.1263E−01 −1.5594E−01 −7.4508E−02 −2.7858E−02 A6 = −5.6702E−02  2.6673E−01   5.1947E−01   3.2424E−01   1.2896E−02 A8 =   7.6761E−02−4.2309E−01 −8.4859E−01 −2.6407E−01   1.6036E−01 A10 = −7.3778E−02  4.2589E−01   9.4746E−01   2.3224E−01 −1.1333E−01 A12 =   4.0345E−02−2.2889E−01 −6.0380E−01 −1.4157E−01   2.0061E−02 A14 = −7.7431E−03  4.9554E−02   1.5535E−01   9.0573E−02 Surface # 7 8 9 10 11 k =−8.1234E+01 −3.6451E+01   8.9797E+01   2.5949E+00   1.4648E+00 A4 =−1.0284E−01 −1.0147E−01   2.7167E−02 −6.5458E−02 −8.0871E−02 A6 =  5.5645E−02 −1.6754E−01 −1.2287E−01   2.9803E−02   2.7861E−02 A8 =  8.7241E−02   2.6888E−01   1.9895E−01 −1.3041E−02 −1.1087E−02 A10 =  1.6876E−02 −3.9705E−02 −1.2223E−01   9.5289E−03   3.0001E−03 A12 =−3.0286E−02 −6.7363E−02   3.2143E−02 −3.6212E−03 −4.9739E−04 A14 =  2.4832E−02 −3.2177E−03   5.5104E−04   3.1937E−05

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in Table 23below are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 21 and Table 22and satisfy the conditions stated in Table 23.

TABLE 23 8^(th) Embodiment f [mm] 5.84 f/R8 −0.48 Fno 2.60 R10/R8 0.48HFOV [deg.] 20.5 (R9 − R10)/(R9 + R10) −0.36 tan(2*HFOV) 0.869 f4/f51.37 Nmax 1.650 SD/TD 0.87 (V2 + V3)/V1 1.38 f/ImgH 2.62 CT3/T34 0.86EPD/ImgH 1.01 T34/ET34 2.84 TL/f 0.92 (T23 + T45)/T34 2.32 TL [mm] 5.40f/R1 4.27

9th Embodiment

FIG. 9A is a schematic view of an image capturing device according tothe 9th embodiment of the present disclosure. FIG. 9B shows, in orderfrom left to right, longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 9th embodiment.

In FIG. 9A, the image capturing device includes an imaging lens system(not otherwise herein labeled) of the present disclosure and an imagesensor 980. The imaging lens system includes, in order from an objectside to an image side, a first lens element 910, a second lens element920, a third lens element 930, a fourth lens element 940, and a fifthlens element 950, wherein the imaging lens system has a total of fivelens elements (910-950) with refractive power.

The first lens element 910 with positive refractive power has anobject-side surface 911 being convex in a paraxial region thereof and animage-side surface 912 being convex in a paraxial region thereof, whichare both aspheric, and the first lens element 910 is made of plasticmaterial.

The second lens element 920 with negative refractive power has anobject-side surface 921 being concave in a paraxial region thereof andan image-side surface 922 being concave in a paraxial region thereof,which are both aspheric, and the second lens element 920 is made ofplastic material.

The third lens element 930 with positive refractive power has anobject-side surface 931 being convex in a paraxial region thereof and animage-side surface 932 being convex in a paraxial region thereof, whichare both aspheric, and the third lens element 930 is made of plasticmaterial. Furthermore, each of the object-side surface 931 and theimage-side surface 932 of the third lens element 930 has at least oneinflection point.

The fourth lens element 940 with negative refractive power has anobject-side surface 941 being concave in a paraxial region thereof andan image-side surface 942 being convex in a paraxial region thereof,which are both aspheric, and the fourth lens element 940 is made ofplastic material.

The fifth lens element 950 with negative refractive power has anobject-side surface 951 being concave in a paraxial region thereof andan image-side surface 952 being convex in a paraxial region thereof,which are both aspheric, and the fifth lens element 950 is made ofplastic material.

The imaging lens system is further provided with an aperture stop 900disposed between the first lens element 910 and the second lens element920, and no lens element with refractive power is disposed between theaperture stop 900 and the first lens element 910. The imaging lenssystem further includes an IR-cut filter 960 located between the fifthlens element 950 and an image surface 970. The IR-cut filter 960 is madeof glass and will not affect the focal length of the imaging lenssystem. The image sensor 980 is disposed on or near the image surface970 of the imaging lens system.

The detailed optical data of the ninth embodiment are shown in TABLE 24,and the aspheric surface data are shown in TABLE 25, wherein the unitsof the curvature radius, the thickness and the focal length areexpressed in mm, and HFOV is half of the maximal field of view.

TABLE 24 (Embodiment 9) f = 6.33 mm, Fno = 2.82, HFOV = 24.5 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe# Length 0Object Plano Infinity 1 Lens 1 1.687 ASP 0.930 Plastic 1.544 55.9 2.86 2−15.930 ASP 0.046 3 Ape. Stop Plano 0.046 4 Lens 2 −19.768 ASP 0.399Plastic 1.639 23.5 −3.85 5 2.832 ASP 0.643 6 Lens 3 9.339 ASP 0.419Plastic 1.639 23.5 10.25 7 −21.534 ASP 0.506 8 Lens 4 −5.085 ASP 0.350Plastic 1.544 55.9 −12.11 9 −22.826 ASP 0.936 10 Lens 5 −3.090 ASP 0.558Plastic 1.535 55.7 −7.15 11 −17.100 ASP 0.300 12 IR-cut filter Plano0.210 Glass 1.517 64.2 — 13 Plano 0.495 14 Image Surface Plano — Note:Reference Wavelength is d-line 587.6 nm

TABLE 25 Aspheric Coefficients Surface # 1 2 4 5 6 k = −4.9381E+00  1.0013E+01   6.9603E+01   6.1302E+00 −2.4360E+01 A4 =   1.2306E−01−1.1949E−01 −1.6738E−01 −9.6001E−02 −7.8012E−02 A6 = −7.4165E−02  2.9374E−01   5.2230E−01   2.5759E−01   1.2954E−03 A8 =   7.5628E−02−4.2786E−01 −8.4113E−01 −3.1805E−01   1.7101E−01 A10 = −7.2173E−02  4.1393E−01   9.4486E−01   2.9326E−01 −1.0782E−01 A12 =   4.0535E−02−2.2864E−01 −6.1393E−01 −1.4070E−01   1.8708E−02 A14 = −9.8933E−03  5.0837E−02   1.6499E−01 −3.4515E−03 Surface # 7 8 9 10 11 k =  9.0000E+01   1.4838E+01 −8.3513E+00   1.4122E+00   2.9186E+01 A4 =−1.0881E−01 −1.1540E−01 −3.7376E−02 −5.4970E−02 −9.8164E−02 A6 =  1.8493E−02 −1.5883E−01 −1.2370E−01   2.1087E−02   3.3451E−02 A8 =  8.0405E−02   2.5651E−01   2.0542E−01 −1.2114E−02 −1.1191E−02 A10 =  1.2550E−02 −4.1586E−02 −1.2190E−01   1.0690E−02   3.0596E−03 A12 =−2.0874E−02 −6.7489E−02   3.2119E−02 −3.5243E−03 −4.9514E−04 A14 =  2.5246E−02 −3.2178E−03   3.9213E−04   3.1761E−05

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in Table 26below are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 24 and Table 25and satisfy the conditions stated in Table 26.

TABLE 26 9^(th) Embodiment f [mm] 6.33 f/R8 −0.28 Fno 2.82 R10/R8 0.75HFOV [deg.] 24.5 (R9 − R10)/(R9 + R10) −0.69 tan(2*HFOV) 1.150 f4/f51.69 Nmax 1.639 SD/TD 0.80 (V2 + V3)/V1 0.84 f/ImgH 2.16 CT3/T34 0.83EPD/ImgH 0.77 T34/ET34 7.16 TL/f 0.92 (T23 + T45)/T34 3.12 TL [mm] 5.84f/R1 3.75

10th Embodiment

FIG. 10A is a schematic view of an image capturing device according tothe 10th embodiment of the present disclosure. FIG. 10B shows, in orderfrom left to right, longitudinal spherical aberration curves, astigmaticfield curves and a distortion curve of the image capturing deviceaccording to the 10th embodiment.

In FIG. 10A, the image capturing device includes an imaging lens system(not otherwise herein labeled) of the present disclosure and an imagesensor 1080. The imaging lens system includes, in order from an objectside to an image side, a first lens element 1010, a second lens element1020, a third lens element 1030, a fourth lens element 1040, and a fifthlens element 1050, wherein the imaging lens system has a total of fivelens elements (1010-1050) with refractive power.

The first lens element 1010 with positive refractive power has anobject-side surface 1011 being convex in a paraxial region thereof andan image-side surface 1012 being convex in a paraxial region thereof,which are both aspheric, and the first lens element 1010 is made ofplastic material.

The second lens element 1020 with negative refractive power has anobject-side surface 1021 being concave in a paraxial region thereof andan image-side surface 1022 being concave in a paraxial region thereof,which are both aspheric, and the second lens element 1020 is made ofplastic material.

The third lens element 1030 with positive refractive power has anobject-side surface 1031 being convex in a paraxial region thereof andan image-side surface 1032 being convex in a paraxial region thereof,which are both aspheric, and the third lens element 1030 is made ofplastic material. Furthermore, each of the object-side surface 1031 andthe image-side surface 1032 of the third lens element 1030 has at leastone inflection point.

The fourth lens element 1040 with negative refractive power has anobject-side surface 1041 being concave in a paraxial region thereof andan image-side surface 1042 being convex in a paraxial region thereof,which are both aspheric, and the fourth lens element 1040 is made ofplastic material.

The fifth lens element 1050 with negative refractive power has anobject-side surface 1051 being concave in a paraxial region thereof andan image-side surface 1052 being convex in a paraxial region thereof,which are both aspheric, and the fifth lens element 1050 is made ofplastic material.

The imaging lens system is further provided with an aperture stop 1000disposed between the first lens element 1010 and the second lens element1020, and no lens element with refractive power is disposed between theaperture stop 1000 and the first lens element 1010. The imaging lenssystem further includes an IR-cut filter 1060 located between the fifthlens element 1050 and an image surface 1070. The IR-cut filter 1060 ismade of glass and will not affect the focal length of the imaging lenssystem. The image sensor 1080 is disposed on or near the image surface1070 of the imaging lens system.

The detailed optical data of the tenth embodiment are shown in TABLE 27,and the aspheric surface data are shown in TABLE 28, wherein the unitsof the curvature radius, the thickness and the focal length areexpressed in mm, and HFOV is half of the maximal field of view.

TABLE 27 (Embodiment 10) f = 6.36 mm, Fno = 2.82, HFOV = 24.5 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Lens 1 1.637 ASP 0.890 Plastic 1.544 55.9 2.842 −21.736 ASP 0.014 3 Ape. Stop Plano 0.036 4 Lens 2 −31.605 ASP 0.300Plastic 1.639 23.5 −3.85 5 2.676 ASP 0.528 6 Lens 3 6.340 ASP 0.486Plastic 1.639 23.5 9.34 7 −97.800 ASP 0.493 8 Lens 4 −4.862 ASP 0.350Plastic 1.544 55.9 −9.40 9 −100.000 ASP 1.223 10 Lens 5 −3.279 ASP 0.513Plastic 1.535 55.7 −9.41 11 −9.921 ASP 0.300 12 IR-cut filter Plano0.210 Glass 1.517 64.2 — 13 Plano 0.497 14 Image Surface Plano — Note:Reference wavelength is d-line 587.6 nm

TABLE 28 Aspheric Coefficients Surface # 1 2 4 5 6 k = −4.5537E+00  1.0013E+01   6.9603E+01   5.1169E+00 −2.4360E+01 A4 =   1.3003E−01−1.1465E−01 −1.8410E−01 −1.3757E−01 −6.2069E−02 A6 = −7.4036E−02  3.9974E−01   6.2294E−01   3.5013E−01   6.0099E−02 A8 =   8.2801E−02−7.9575E−01 −1.1671E+00 −6.0010E−01   1.1507E−01 A10 = −8.3011E−02  9.6617E−01   1.4533E+00   8.7491E−01 −8.4800E−02 A12 =   4.8431E−02−6.1874E−01 −9.8430E−01 −7.2029E−01   1.0786E−02 A14 = −1.2399E−02  1.5507E−01   2.6590E−01   2.1608E−01 Surface # 7 8 9 10 11 k =  9.0000E+01   1.5389E+01 −8.3513E+00   9.0509E−01   9.4081E+00 A4 =−1.0310E−01 −2.1835E−01 −1.3284E−01 −6.1503E−02 −7.1742E−02 A6 =  1.1527E−01   9.8591E−02   9.4205E−02   3.2047E−02   3.2444E−02 A8 =−1.8153E−02   1.5329E−01   3.1151E−02 −5.0339E−03 −1.1851E−02 A10 =  9.5627E−02 −1.5890E−01 −5.9510E−02 −2.8861E−04   2.9732E−03 A12 =−5.7180E−02   5.4126E−02   2.2742E−02   2.3711E−04 −4.8532E−04 A14 =−9.3060E−03 −2.9069E−03 −2.1250E−05   3.6592E−05

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in Table 29below are the same as those stated in the 1st embodiment withcorresponding values for the 10th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 27 and Table 28and satisfy the conditions stated in Table 29.

TABLE 29 10^(th) Embodiment f [mm] 6.36 f/R8 −0.06 Fno 2.82 R10/R8 0.10HFOV [deg.] 24.5 (R9 − R10)/(R9 + R10) −0.50 tan(2*HFOV) 1.150 f4/f51.00 Nmax 1.639 SD/TD 0.81 (V2 + V3)/V1 0.84 f/ImgH 2.17 CT3/T34 0.99EPD/ImgH 0.77 T34/ET34 7.26 TL/f 0.92 (T23 + T45)/T34 3.55 TL [mm] 5.84f/R1 3.88

The foregoing description, for purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-29 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. An imaging lens system comprising five lenselements, the five lens elements being, in order from an object side toan image side: a first lens element, a second lens element, a third lenselement, a fourth lens element and a fifth lens element; wherein each ofthe five lens elements comprises an object-side surface facing towardthe object side and an image-side surface facing toward the image side,and a central thickness of the first lens element is the largest amongcentral thicknesses of all the lens elements; wherein the image-sidesurface of the first lens element is concave in a paraxial regionthereof and the third lens element has at least one inflection point;wherein an axial distance between the object-side surface of the firstlens element and an image surface is TL, a focal length of the imaginglens system is f, a half of maximal field of view of the imaging lenssystem is HFOV, and the following conditions are satisfied:0.75<TL/f<1.0; and0.3<tan(2*HFOV)<1.0.
 2. The imaging lens system of claim 1, wherein thefirst lens element has positive refractive power, the object-sidesurface of the first lens element is convex in a paraxial regionthereof, the object-side surface of the third lens element is convex ina paraxial region thereof, and the image-side surface of the third lenselement is concave in a paraxial region thereof.
 3. The imaging lenssystem of claim 1, wherein the image-side surface of the fourth lenselement is concave in a paraxial region thereof.
 4. The imaging lenssystem of claim 1, wherein the fourth lens element has negativerefractive power and the fifth lens element has negative refractivepower.
 5. The imaging lens system of claim 1, wherein an Abbe number ofthe first lens element is V1, an Abbe number of the second lens elementis V2, an Abbe number of the third lens element is V3, and the followingcondition is satisfied:0.5<(V2+V3)N1<1.0.
 6. The imaging lens system of claim 1, wherein acentral thickness of the third lens element is CT3, an axial distancebetween the third lens element and the fourth lens element is T34, anentrance pupil diameter of the imaging lens system is EPD, a maximumimage height of the imaging lens system is ImgH, and the followingconditions are satisfied:0.2<CT3/T34<2.2; and0.7<EPD/ImgH<1.6.
 7. The imaging lens system of claim 1, wherein theimaging lens system further comprises an aperture stop, an axialdistance between the aperture stop and the image-side surface of thefifth lens element is SD, an axial distance between the object-sidesurface of the first lens element and the image-side surface of thefifth lens element is TD, the focal length of the imaging lens system isf, a maximum image height of the imaging lens system is ImgH, and thefollowing conditions are satisfied:2.1<f/ImgH<6.0; and0.7<SD/TD<1.0.
 8. The imaging lens system of claim 1, wherein theobject-side surface of the second lens element is convex in a paraxialregion thereof and the image-side surface of the second lens element isconcave in a paraxial region thereof, a maximum refractive index amongrefractive indices of the first lens element, the second lens element,the third lens element, the fourth lens element and the fifth lenselement is Nmax, and the following condition is satisfied:1.50<Nmax<1.70.
 9. The imaging lens system of claim 1, wherein an airgap is arranged on an optical axis between each of adjacent lenselements of the five lens elements, the axial distance between theobject-side surface of the first lens element and the image surface isTL, and the following condition is satisfied:TL<7.5 mm.
 10. An image capturing device, comprising: the imaging lenssystem of claim 1; and an image sensor disposed on the image surface ofthe imaging lens system.
 11. An electronic device, comprising: the imagecapturing device of claim
 10. 12. An imaging lens system comprising fivelens elements, the five lens elements being, in order from an objectside to an image side: a first lens element, a second lens element, athird lens element, a fourth lens element and a fifth lens element;wherein each of the five lens elements comprises an object-side surfacefacing toward the object side and an image-side surface facing towardthe image side, and a central thickness of the first lens element is thelargest among central thicknesses of all the lens elements; wherein thethird lens element has at least one inflection point; wherein an axialdistance between the object-side surface of the first lens element andan image surface is TL, a focal length of the imaging lens system is f,a half of maximal field of view of the imaging lens system is HFOV, amaximum refractive index among refractive indices of the first lenselement, the second lens element, the third lens element, the fourthlens element and the fifth lens element is Nmax, an axial distancebetween the second lens element and the third lens element is T23, anaxial distance between the third lens element and the fourth lenselement is T34, an axial distance between the fourth lens element andthe fifth lens element is T45, and the following conditions aresatisfied:0.75<TL/f<1.0;0.3<tan(2*HFOV)<1.0;1.639≤Nmax<1.70; and0.5<(T23+T45)/T34<6.0.
 13. The imaging lens system of claim 12, whereinthe image-side surface of the fifth lens element is convex in a paraxialregion thereof, and each of the five lens elements is made of plasticmaterial.
 14. The imaging lens system of claim 12, wherein the fourthlens element has negative refractive power and the fifth lens elementhas negative refractive power.
 15. The imaging lens system of claim 12,wherein the axial distance between the second lens element and the thirdlens element is T23, the axial distance between the third lens elementand the fourth lens element is T34, the axial distance between thefourth lens element and the fifth lens element is T45, and the followingcondition is satisfied:2.3<(T23+T45)/T34<5.5.
 16. The imaging lens system of claim 12, whereinthe focal length of the image lens system is f, a curvature radius ofthe image-side surface of the fourth lens element is R8, and thefollowing condition is satisfied:−1.4<f/R8<1.4.
 17. The imaging lens system of claim 12, wherein theimaging lens system further comprises an aperture stop, an axialdistance between the aperture stop and the image-side surface of thefifth lens element is SD, an axial distance between the object-sidesurface of the first lens element and the image-side surface of thefifth lens element is TD, and the following condition is satisfied:0.7<SD/TD<1.0.
 18. The imaging lens system of claim 12, wherein each ofthe third lens element, the fourth lens element and the fifth lenselement has at least an aspheric surface, a curvature radius of theobject-side surface of the fifth lens element is R9, a curvature radiusof the image-side surface of the fifth lens element is R10, and thefollowing condition is satisfied:−1.0<(R9−R10)/(R9+R10)<0.
 19. The imaging lens system of claim 12,wherein an air gap is arranged on an optical axis between each ofadjacent lens elements of the five lens elements, an entrance pupildiameter of the imaging lens system is EPD, a maximum image height ofthe imaging lens system is ImgH, and the following condition issatisfied:0.7<EPD/ImgH<1.6.
 20. An imaging lens system comprising five lenselements, the five lens elements being, in order from an object side toan image side: a first lens element, a second lens element, a third lenselement, a fourth lens element and a fifth lens element; wherein each ofthe five lens elements comprises an object-side surface facing towardthe object side and an image-side surface facing toward the image side,at least one of the five lens elements comprises at least one asphericsurface, a central thickness of the first lens element is the largestamong central thicknesses of all the lens elements, an axial distancebetween the fourth lens element and the fifth lens element is thelargest among all axial distances between adjacent lens elements, thefirst lens element has positive refractive power, the second lenselement has negative refractive power, the object-side surface of thesecond lens element is convex in a paraxial region thereof and theimage-side surface of the second lens element is concave in a paraxialregion thereof; wherein an axial distance between the object-sidesurface of the first lens element and an image surface is TL, a focallength of the imaging lens system is f, a maximum refractive index amongrefractive indices of the first lens element, the second lens element,the third lens element, the fourth lens element and the fifth lenselement is Nmax, and the following conditions are satisfied:0.75<TL/f<1.0;1.50<Nmax<1.70.
 21. The imaging lens system of claim 20, wherein thefourth lens element has negative refractive power.
 22. The imaging lenssystem of claim 20, wherein the third lens element has positiverefractive power and at least one inflection point.
 23. The imaging lenssystem of claim 20, wherein a curvature radius of the object-sidesurface of the fifth lens element is R9, a curvature radius of theimage-side surface of the fifth lens element is R10, and the followingcondition is satisfied:−1.0<(R9−R10)/(R9+R10)<0.
 24. The imaging lens system of claim 20,wherein the focal length of the image lens system is f, a curvatureradius of the image-side surface of the fourth lens element is R8, andthe following condition is satisfied:−1.8<f/R8<1.8.
 25. The imaging lens system of claim 20, wherein each ofthe five lens elements is made of plastic material, a half of maximalfield of view of the imaging lens system is HFOV, and the followingcondition is satisfied:0.3<tan(2*HFOV)<1.0.
 26. An imaging lens system comprising five lenselements, the five lens elements being, in order from an object side toan image side: a first lens element, a second lens element, a third lenselement, a fourth lens element and a fifth lens element; wherein each ofthe five lens elements comprises an object-side surface facing towardthe object side and an image-side surface facing toward the image side,at least one of the five lens elements comprises at least one asphericsurface, a central thickness of the first lens element is the largestamong central thicknesses of all the lens elements, an axial distancebetween the fourth lens element and the fifth lens element is thelargest among all axial distances between adjacent lens elements;wherein the image-side surface of the first lens element is concave in aparaxial region thereof, an axial distance between the object-sidesurface of the first lens element and an image surface is TL, a focallength of the imaging lens system is f, a maximum refractive index amongrefractive indices of the first lens element, the second lens element,the third lens element, the fourth lens element and the fifth lenselement is Nmax, a maximum image height of the imaging lens system isImgH, and the following conditions are satisfied:0.75<TL/f<1.0;1.50<Nmax<1.70; and2.1<f/ImgH<6.0.
 27. The imaging lens system of claim 26, wherein anentrance pupil diameter of the imaging lens system is EPD, the maximumimage height of the imaging lens system is ImgH, and the followingcondition is satisfied:0.7<EPD/ImgH<1.6.
 28. The imaging lens system of claim 26, wherein anair gap is arranged on an optical axis between each of adjacent lenselements of the five lens elements, the imaging lens system furthercomprises an aperture stop, an axial distance between the aperture stopand the image-side surface of the fifth lens element is SD, an axialdistance between the object-side surface of the first lens element andthe image-side surface of the fifth lens element is TD, and thefollowing condition is satisfied:0.7<SD/TD<1.0.
 29. The imaging lens system of claim 26, wherein an axialdistance between the object-side surface of the first lens element andthe image surface is TL, the focal length of the imaging lens system isf, a curvature radius of the object-side surface of the first lenselement is R1, and the following conditions are satisfied:TL<7.5 mm; and3.3<f/R1.